xcode 12 ios14 运行报错

[clin003]

Flutter 1.22.0-10.0.pre.221
xcode 12 模拟器iphone ios14环境

flutter run 后 报错
../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart:710:9: Error: Type 'Overflow' not found.
final Overflow overflow;
^^^^^^^^
../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart:756:5: Error: Type 'Overflow' not found.
Overflow overflow = Overflow.clip,
^^^^^^^^
../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart:845:3: Error: Type 'Overflow' not found.
Overflow get overflow => _overflow;
^^^^^^^^
../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart:846:3: Error: Type 'Overflow' not found.
Overflow _overflow;
^^^^^^^^
../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart:848:16: Error: Type 'Overflow' not found.
set overflow(Overflow value) {
^^^^^^^^
../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart:469:17: Error: The getter 'Overflow' isn't defined for the class '_FSuperState'.
- '_FSuperState' is from 'package:fsuper/fsuper.dart' ('../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'Overflow'.
overflow: Overflow.visible,
^^^^^^^^
../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart:667:21: Error: Getter not found: 'Overflow'.
this.overflow = Overflow.clip,
^^^^^^^^
../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart:710:9: Error: 'Overflow' isn't a type.
final Overflow overflow;
^^^^^^^^
../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart:739:33: Error: 'Overflow' isn't a type.
properties.add(EnumProperty('overflow', overflow));
^^^^^^^^
../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart:756:5: Error: 'Overflow' isn't a type.
Overflow overflow = Overflow.clip,
^^^^^^^^
../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart:756:25: Error: Getter not found: 'Overflow'.
Overflow overflow = Overflow.clip,
^^^^^^^^
../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart:846:3: Error: 'Overflow' isn't a type.
Overflow _overflow;
^^^^^^^^
../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart:848:16: Error: 'Overflow' isn't a type.
set overflow(Overflow value) {
^^^^^^^^
../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart:1049:22: Error: The getter 'Overflow' isn't defined for the class '_RenderStack'.
- '_RenderStack' is from 'package:fsuper/fsuper.dart' ('../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'Overflow'.
if (_overflow == Overflow.clip && _hasVisualOverflow) {
^^^^^^^^
../../../../.pub-cache/hosted/pub.flutter-io.cn/fsuper-2.0.2/lib/fsuper.dart:1068:33: Error: 'Overflow' isn't a type.
properties.add(EnumProperty('overflow', overflow));
^^^^^^^^

[chenBingX]

尝试切换一下flutter版本至：
Flutter 1.22.4 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 1aafb3a8b9 (9 weeks ago) • 2020-11-13 09:59:28 -0800
Engine • revision 2c956a31c0
Tools • Dart 2.10.4